When you look at the Boston Celtics’ bench, you’re not going to find many (any?) players who are consistent shot-makers. But defensively, in this small-ball era we live in, the potential for Boston’s second unit to put the clamps on teams defensively is apparent. We saw that in Boston’s 102-93 win over Memphis in the fourth quarter when the Celtics opened with a 16-0 run that put them ahead for good. During the run, the Celtics forced four turnovers along with creating seven straight misses by the Grizzlies to start the quarter. “Shane (Larkin) and Terry (Rozier) did a great job on the ball,” said Celtics head coach Brad Stevens. “We had to change some coverages because of (Marc) Gasol. And then just kind of stayed with it.” The Grizzlies wound up shooting 33.3 percent (6-for-18) in the fourth quarter which was heavily impacted by Boston's fourth quarter defensive rating being an impressive 90.1. And while the play of starters Jayson Tatum (19 points, seven in the fourth quarter), Kyrie Irving (team-high 20 points) and Al Horford (15 points, seven rebounds, six assists) was key to the victory, the second unit’s play defensively to start the fourth was ultimately what paved the way for Boston to improve its East-leading record to 25-7. In a interview with NBC Sports Boston prior to Saturday’s game, Rozier discussed the need for the bench to step up in every aspect of the game. “When the starters are doing good, we have to keep it going and when they struggle a little bit, we have change the game up, get the momentum back on our side,” said Rozier who in addition to playing good defense on Saturday, also had 10 points and four rebounds.